| 摘要 |
<p>A compensating current is outputted except during an interval where a leakage current is not pronounced, so that losses resulting from the passage of the compensating current are reduced. A diode bridge (11) has a pair of input ends to which an alternating current is inputted from an AC power supply (3), and a pair of output ends (111, 112) which output a direct current. A boost chopper circuit (12) is connected to the pair of output ends (111, 112), and sets up a DC voltage inputted thereto. The boost chopper circuit (12) functions as a power factor correction circuit. A smoothing capacitor (13) is connected to an output side of the boost chopper circuit (12), and smoothes the voltage across the smoothing capacitor (13). An inverter (14) receives the voltage across the smoothing capacitor (13) to apply AC power to a load (4). A leakage current reduction device (2) outputs a compensating current (Ic) which compensates for a leakage current (Ia) leaking from the load (4). The leakage current reduction device (2) outputs the compensating current (Ic) except near the zero crossing of the alternating current inputted from the AC power supply (3).</p> |
